1. ● short (flash or sound) (one second)

2. ■ long (flash or sound) (more than 3 seconds)

3. Flash or sound interval within the command is 2-3 seconds

4. Flash or sound interval between commands is more than 30 seconds

International SOS emergency help: three short, three long, three short, continue to repeat after one minute.

International high mountain emergency help: six short, continue to repeat in a minute.

The international general Alpine emergency signal and the international general SOS emergency signal can be common, but 6 short signal belongs to alpine signal and SOS belongs to general signal.

Communication (T): ■ it is used for the contact of teams to determine the orientation between each other. After receiving the signal, it will be sent to represent the receipt of the signal;

Set (U): ●●■ set in the direction of signal sending;

Forward (V): ● ■ when resting, it means the whole team starts, and when moving, it means accelerating;

Waiting in front of the team (W): ●■■ it is used to require the front team to wait for the back team when the team travels too long;

Request for support (s): ●●●● send out when you need help in case of difficulties, and the person receiving the signal will reply with a communication tone (T) to indicate that he will go to support;

SOS: This is an International SOS code.

Report the location and contact the front or rear team: ■■■ if no response signal is received, it can be repeated in one minute; After receiving the three long signals, respond to the signal and report safe: three short, which can be repeated in a minute.

We all need to know the meaning of the above signals, but don't send them indiscriminately. In addition to the rescue signals, other signals are generally sent by the front, middle and rear personnel.